Edutopia is a nice resource for finding out more about Project Based Learning. There are a couple short videos to watch and other links for you to use.
This site is from the George Lucas Education Foundation. There is also a "Big List" on their site with many links to read about Project Learning from other Educators.
The Think Quest Library can also provide resources from already created projects. These are done by student teams. Click here to read more... This is a site that I enjoy looking at to get ideas for my own use, see what you think!
